CN110508293A - 一种用于光解水制氢的中空多级p-n结NiO@CdS复合纳米材料及其制备方法 - Google Patents
一种用于光解水制氢的中空多级p-n结NiO@CdS复合纳米材料及其制备方法 Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 239000002131 composite material Substances 0.000 title claims abstract description 48
- 239000001257 hydrogen Substances 0.000 title claims abstract description 44
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 44
- 239000002086 nanomaterial Substances 0.000 title claims abstract description 44
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 32
- 238000006303 photolysis reaction Methods 0.000 title claims abstract description 29
- 230000015843 photosynthesis, light reaction Effects 0.000 title claims abstract description 28
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 16
- 229910052793 cadmium Inorganic materials 0.000 claims abstract description 10
- 239000002105 nanoparticle Substances 0.000 claims abstract description 10
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 150000002431 hydrogen Chemical class 0.000 claims abstract description 8
- 230000008569 process Effects 0.000 claims abstract description 8
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- 229910052980 cadmium sulfide Inorganic materials 0.000 claims description 62
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- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims description 18
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 11
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- 229910000480 nickel oxide Inorganic materials 0.000 claims description 10
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 claims description 10
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 8
- 239000000908 ammonium hydroxide Substances 0.000 claims description 8
- WUPHOULIZUERAE-UHFFFAOYSA-N 3-(oxolan-2-yl)propanoic acid Chemical compound OC(=O)CCC1CCCO1 WUPHOULIZUERAE-UHFFFAOYSA-N 0.000 claims description 7
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 claims description 7
- 239000004202 carbamide Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 229910021586 Nickel(II) chloride Inorganic materials 0.000 claims description 5
- QMMRZOWCJAIUJA-UHFFFAOYSA-L nickel dichloride Chemical compound Cl[Ni]Cl QMMRZOWCJAIUJA-UHFFFAOYSA-L 0.000 claims description 5
- LHQLJMJLROMYRN-UHFFFAOYSA-L cadmium acetate Chemical compound [Cd+2].CC([O-])=O.CC([O-])=O LHQLJMJLROMYRN-UHFFFAOYSA-L 0.000 claims description 4
- 239000000047 product Substances 0.000 claims description 4
- 238000001179 sorption measurement Methods 0.000 claims description 4
- 229910052984 zinc sulfide Inorganic materials 0.000 claims description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 2
- 239000005864 Sulphur Substances 0.000 claims description 2
- 238000001354 calcination Methods 0.000 claims description 2
- 239000007795 chemical reaction product Substances 0.000 claims description 2
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- DSEJHVPAEQHWGW-UHFFFAOYSA-L [OH-].[NH4+].[Ni](Cl)Cl Chemical compound [OH-].[NH4+].[Ni](Cl)Cl DSEJHVPAEQHWGW-UHFFFAOYSA-L 0.000 claims 1
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- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 3
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- AUIZLSZEDUYGDE-UHFFFAOYSA-L cadmium(2+);diacetate;dihydrate Chemical compound O.O.[Cd+2].CC([O-])=O.CC([O-])=O AUIZLSZEDUYGDE-UHFFFAOYSA-L 0.000 description 3
- 239000000463 material Substances 0.000 description 3
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- LAIZPRYFQUWUBN-UHFFFAOYSA-L nickel chloride hexahydrate Chemical compound O.O.O.O.O.O.[Cl-].[Cl-].[Ni+2] LAIZPRYFQUWUBN-UHFFFAOYSA-L 0.000 description 3
- 238000011160 research Methods 0.000 description 3
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
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- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 2
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
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- 241000209094 Oryza Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- QWCAGKZBJUCBEI-UHFFFAOYSA-N [C+4].[S-2].[Cd+2].[S-2].[S-2] Chemical compound [C+4].[S-2].[Cd+2].[S-2].[S-2] QWCAGKZBJUCBEI-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- WLZRMCYVCSSEQC-UHFFFAOYSA-N cadmium(2+) Chemical compound [Cd+2] WLZRMCYVCSSEQC-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000003421 catalytic decomposition reaction Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
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- 238000011017 operating method Methods 0.000 description 1
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- 235000009566 rice Nutrition 0.000 description 1
- 229910052979 sodium sulfide Inorganic materials 0.000 description 1
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
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Abstract
本发明涉及一种用于光解水制氢的中空多级p‑n结NiO@CdS复合纳米材料及其制备方法,NiO@CdS复合材料由n‑CdS纳米颗粒紧密负载在p‑NiO空心微球的表面上构成,CdS纳米颗粒的粒径为10‑30nm,NiO空心微球的外直径为0.8‑1.2μm,由多孔的厚度约8nm的NiO纳米片交叠组装而成。该方法采用廉价易得的镍源和镉源,通过四步工艺技术路线将n‑CdS纳米颗粒负载在p‑NiO空心微球的表面上,制得p‑n结NiO/CdS复合纳米中空结构。此复合材料结构新颖,比表面积大,可促进光生载流子的有效分离,作为可见光催化剂具有优越的光解水制氢性能。
Description
技术领域
本发明涉及可见光催化剂材料制备技术领域,具体涉及一种用于光解水制氢的中空多级p-n结NiO@CdS复合纳米材料及其制备方法。
背景技术
自近现代以来,由于大量消耗煤炭、石油及天然气等化石原料,人类面临着极大的能源危机和严峻的环境污染问题。寻找新能源的研究越来越受到人们的关注。氢能,它作为二次能源,具有清洁、高效、安全、可贮存、可运输等诸多优点,已普遍被人们认为是一种最理想的新世纪无污染的绿色能源,因此受到了各国的高度重视。太阳能是人类取之不尽,用之不竭的永久性能源,利用太阳能光催化分解水制氢是循环经济,绿色制氢的最有效途径之一。
光解水制氢技术始自1972年,由日本东京大学Fujishima A和Honda K两位教授首次报告发现TiO2单晶电极光催化分解水从而产生氢气这一现象,从而揭示了利用太阳能直接分解水制氢的可能性,开辟了利用太阳能光解水制氢的研究道路。随着电极电解水向半导体光催化分解水制氢的多相光催化的演变和TiO2以外的光催化剂的相继发现,兴起了以光催化方法分解水制氢(简称光解水)的研究,并在光催化剂的合成、改性等方面取得较大进展。
目前针对分解水制氢的光催化剂研究较多,但是制备出的光催化剂普遍存在操作方法繁琐,光催化剂催化效率低等缺陷,如名称为“一种p-n结空心球的制备及在光催化分解水制氢中的应用”(专利申请号:200910023546.8)的中国专利申请文件中记载到如下技术方案:称取适量蔗糖配制成蔗糖水溶液,放入高压反应釜中,165℃温度下水热合成碳纳米球,作为硬模板剂;称取适量Cd(NO3)2·4H2O配制成水溶液;称取适量Na2S·9H2O配制成水溶液;在室温下,将碳纳米球分散在无水乙醇中,进行超声波分散,烘干;将Cd(NO3)2·4H2O的水溶液浸渍于制备的碳纳米球中,室温晾干,制得镉离子包裹的碳纳米球C-Cd,在室温下,将步骤3)中的Na2S·9H2O的水溶液缓慢滴加至所制备的C-Cd中,浸渍,洗涤,烘干,得到硫化镉包裹的碳纳米球C-CdS,称取适量的Ni(NO3)2·6H2O配制成水溶液;将制得的Ni(NO3)2·6H2O水溶液缓慢滴加至制备的C-CdS中浸渍,室温晾干,制得镍离子包覆的硫化镉碳纳米球C-CdS-Ni ,称取适量NaOH配制成水溶液,缓慢滴加至镍离子包覆的硫化镉碳纳米球C-CdS-Ni 中,浸渍过夜,洗涤烘干,即制得碳核上依次包裹硫化镉和NiOH核壳结构的复合材料C-CdS-Ni(OH)2;再将所制备的核壳结构复合材料C-CdS-Ni(OH)2,在马弗炉中于400℃焙烧2h,得到p-n结空心球NiO-CdS纳米复合材料。
上述方法虽然获取得到了p-n结空心球NiO-CdS纳米复合材料,但制备中需要预制备碳纳米球做硬模板,过程繁琐、产量低,制备的空心球NiO-CdS纳米复合材料没有显著的微纳米结构特征,作为可见光催化剂应用于光解水产氢性能较差,有待进一步提升。
发明内容
本发明的目的是提供一种用于光解水制氢的中空多级p-n结NiO@CdS复合纳米材料,产量高、重复性好,原料价廉易得,适合产业化生产,且实现了太阳能的有效利用和绿色能源的清洁生产。
本发明采取的技术方案具体如下:
一种用于光解水制氢的中空多级p-n结NiO@CdS复合纳米材料,为内部中空的球形结构,球壳由各p型氧化镍纳米片组装而成,氧化镍纳米片所处的平面与球壳的厚度方向保持一致,相邻的纳米片之间围合构成孔隙,氧化镍纳米片的表面为介孔结构,n型硫化镉纳米颗粒负载在p型氧化镍纳米片的表面,形成具有p-n结的NiO/CdS复合纳米结构。
硫化镉为六方纤锌矿相结构,纳米颗粒的粒径为10-30nm,氧化镍为立方相结构,中空微球的外直径为0.8-1.2μm,由多孔的厚度为7~9nm的纳米片交叠组装而成。
本发明还提供一种用于光解水制氢的中空多级p-n结NiO@CdS复合纳米材料的制备方法,包括制备NiO-Cd(Tu)x 2+中空微球和将NiO-Cd(Tu)x 2+中空微球进行热处理得到多级p-n结NiO@CdS复合纳米材料。
NiO-Cd(Tu)x 2+中空微球的制备方法具体如下:
将溶液A与溶液B混合进行恒温反应,然后对恒温反应后的产物进行烧焙处理得到NiO中空微球,再将NiO中空微球分散于溶液C中,加入溶液D进行反应处理制得NiO-Cd(Tu)x 2+中空微球。
溶液A为镍源溶液;
溶液B为沉淀剂溶液;
溶液C为镉源溶液;
溶液D为硫源溶液。
热处理为微波处理。
溶液A为氯化镍溶液与氨水混合配制而成,按照每1mol氯化镍加入4mL氨水混合配制而成,氨水的质量浓度为25%-28%。
溶液B为尿素水溶液,溶液A与溶液B按照氯化镍与尿素的摩尔比为1:1~10进行混合反应。
溶液D为硫脲水溶液与乙二胺的混合液,按照每1mol硫脲加入0.1~0.4mL乙二胺的比例混合配制成。
溶液C为醋酸镉水溶液,溶液C与溶液D按照醋酸镉与硫脲的摩尔比为0.1~1:1进行反应。
溶液A与溶液B反应在恒温水浴锅中进行,水浴的温度为90℃,反应时间为2.5h,对反应产物进行抽滤、洗涤、干燥、研磨后得到Ni(OH)2中空微球。
焙烧处理是将Ni(OH)2中空微球在马弗炉中进行焙烧得到NiO中空微球,控制焙烧温度为400℃,时间为2小时。
NiO中空微球浸渍于溶液C中后,超声分散10min,加入溶液D混匀,采用PE膜封口,磁力搅拌反应12h,得到吸附镉离子配合物的NiO-Cd(Tu)x 2+中空微球。
微波加热时间为30min,功率800W。
本发明取得的技术效果为:
1)本发明制备的用于光解水制氢的中空多级p-n结NiO@CdS复合纳米材料,由立方相纳米片交错组装成中部有空腔的多级结构由n-CdS纳米颗粒紧密负载在p-NiO空心微球的表面上构成,CdS纳米颗粒的粒径为10-30nm,为六方纤锌矿相结构,NiO空心微球的外直径为0.8-1.2μm,由厚度约8nm(7~9nm)的NiO纳米片交叠组装而成。此复合材料结构新颖,比表面积大,可促进光生载流子的有效分离,作为可见光催化剂具有优越的光解水制氢性能,能够在CdS含量较低的情形实现较高性能的光解水制氢性能。
2)本发明的一种多级p-n结NiO@CdS中空微球的制备方法,工艺设备简单,操作简便,产量高、重复性好,原料价廉易得,适合产业化生产。
3)制得的多级p-n结NiO@CdS复合纳米材料作为太阳能可见光催化分解水制氢的光催化剂,p-n结耦合作用可以促进光生载流子的有效分离,大幅度提高了光解水制氢产率,且制氢过程绿色环保,实现了太阳能的有效利用和绿色能源的清洁生产。
附图说明
图1为制备多级p-n结NiO@CdS复合纳米材料的技术路线;
图2为实施例1中制备的多级p-n结NiO@CdS复合纳米材料的X射线衍射分析(XRD)谱图;
图3为实施例1制备的多级p-n结NiO@CdS复合纳米材料的低倍场发射扫描电子显微镜(FE-SEM)照片;
图4为实施例1制备的多级p-n结NiO@CdS复合纳米材料的高倍场发射扫描电子显微镜(FE-SEM)照片;
图5为实施例1制备的多级p-n结NiO@CdS复合纳米材料的透射电子显微镜(TEM)照片。
具体实施方式
为了使本发明的目的及优点更加清楚明白,以下结合实施例对本发明进行具体说明。应当理解,以下文字仅仅用以描述本发明的一种或几种具体的实施方式,并不对本发明具体请求的保护范围进行严格限定。
本发明利用廉价的镍源和镉源,采用化学浴沉积法-焙烧热处理法-浸渍吸附法-微波加热法四步工艺路线。在制备方法中,六水合氯化镍的用量为1mmol,氨水(w/w:25~28%)的体积为4mL,尿素的用量为1~10mmol;NiO中空微球的用量是0.1g,二水合醋酸镉的用量为0.1~1mmol,硫脲的用量为1.0mmol,乙二胺的体积为0.1~0.4mL。制备的技术路线如图1所示。
实施例1:
(1)称取1.0mmol六水合氯化镍(NiCl2·6H2O)溶解于30mL去离子水中,磁力搅拌30min后加入4mL氨水,继续搅拌得溶液A;称取2mmol尿素溶解于30mL去离子水,磁力搅拌得溶液B;
(2)将步骤1)中配置的溶液A和B混合均匀后,在90℃的恒温水浴锅中加热2.5小时,自然冷却后,抽滤、洗涤、干燥、研磨,得到Ni(OH)2空心微球;
(3)将步骤2)所制备的Ni(OH)2空心微球,在马弗炉中于400℃焙烧2小时,得到多级结构立方相NiO中空微球;
(4)称取1.0mmol二水合醋酸镉(Cd(Ac)2·2H2O)溶解于30mL去离子水中得溶液C;
(5)称取1.0mmol硫脲溶解于30mL去离子水中,磁力搅拌30min后加入0.4mL乙二胺,得溶液D;
(6)在室温下,称取0.1g步骤3)中的NiO中空微球浸渍于在步骤4)的溶液C中,超声分散10min后,加入步骤5)的溶液D,封上PE膜,磁力搅拌12h,得到吸附镉离子配合物的NiO-Cd(Tu)x 2+中空微球;
(7) 将步骤6)得到的混合悬浊液微波发生器中,启动微波加热30分钟(功率800W,18%),沉淀物经抽滤、洗涤、干燥、研磨,即得到多级p-n结NiO@CdS复合纳米材料。产品的场扫描电子显微镜(FE-SEM) 照片如图3所示,透射电子显微镜(TEM)照片如图4所示。
参见附图1,按实施例1制得的多级p-n结NiO@CdS复合纳米材料的制备技术路线图。该法利用廉价的镍源和镉源,采用化学浴沉积法-焙烧法-浸渍吸附法-微波加热法四步工艺路线,制备出一种多级的p-n结NiO@CdS复合纳米材料,此制备方法工艺设备简单,操作简便,适合产业化生产。
参见附图2,按实施例1制得的多级p-n结NiO@CdS复合纳米材料的X-射线粉末衍射分析(XRD)谱图。图中可见用#标示的谱线峰对应于JCPDF标准卡片(47-1049)的衍射晶面,指标为立方相的NiO晶体;用*标示的谱线峰对应于JCPDF标准卡片(41-1049)的衍射晶面,指标为六方纤锌矿相的CdS晶体。CdS晶体衍射峰呈现宽化,表明晶体粒径小;没有发现其他杂质峰,表明样品纯度高。
参见附图3-4,按实施例1制备的多级p-n结NiO@CdS复合纳米材料的场发射扫描电子显微镜(FE-SEM)低倍和高倍照片。从图3中可以看出,由纳米片组装而成的NiO微球分散性较好,粒径相对均匀,外直径介于600-1000nm;大量呈球形的CdS纳米颗粒均匀的附着在NiO微球的表面上。从图4中可进一步看出NiO微球由多孔纳米片组装而成,清晰地显示球壳由多孔纳米片互相交错连接而成,纳米片的平均厚度约8nm,纳米片表面上含有大量的介孔结构,孔径约5-20nm;多数球形CdS纳米颗粒生长在多孔纳米片的表面,少量附着在侧面,CdS纳米晶的粒径约10-30nm。
参见附图5,按实施例1制备的多级p-n结NiO@CdS复合纳米材料的透射电子显微镜(TEM)照片,从图中明显地看出微球内部有较大孔腔,空腔内部直径约400-600nm,具有典型的大孔结构。
实施例2:
(1)称取1.0mmol六水合氯化镍(NiCl2·6H2O)溶解于30mL去离子水中,磁力搅拌30min后加入4mL氨水,继续搅拌得溶液A;称取10mmol尿素溶解于30mL去离子水,磁力搅拌得溶液B;
(2)将步骤1)中配置的溶液A和B混合均匀后,在90℃的恒温水浴锅中加热2.5小时,自然冷却后,抽滤、洗涤、干燥、研磨,得到Ni(OH)2空心微球;
(3)将步骤2)所制备的Ni(OH)2空心微球,在马弗炉中于400℃焙烧2小时,得到多级结构立方相NiO中空微球;
(4)称取0.4mmol二水合醋酸镉(Cd(Ac)2·2H2O)溶解于30mL去离子水中得溶液C;
(5)称取1.0mmol硫脲溶解于30mL去离子水中,磁力搅拌30min后加入0.1mL乙二胺,得溶液D。
(6)在室温下,称取0.1g步骤3)中的NiO中空微球浸渍于在步骤4)的溶液C中,超声分散10min后,加入步骤5)的溶液D,封上PE膜,磁力搅拌12h,得到吸附镉离子配合物的NiO-Cd(Tu)x 2+中空微球。
(7) 将步骤6)得到的混合悬浊液微波发生器中,启动微波加热30分钟(功率800W,18%),沉淀物经抽滤、洗涤、干燥、研磨,即得到多级p-n结NiO@CdS复合纳米材料。
实施例3:(多级p-n结NiO@CdS复合纳米材料的光催化分解水制氢实验)
制备的多级p-n结NiO@CdS复合纳米材料的太阳光催化分解水制氢实验在MC-SPH2O全自动光催化全解水实验测试系统上进行。
在100mLPrex玻璃平底反应器中,分别称取空穴牺牲剂1.25gNa2S和0.75gNa2SO3,用50mL去离子水溶解得溶液;称取实施例1中制备的多级p-n结NiO@CdS复合纳米材料0.1g加入到反应瓶中,在暗处搅拌30min,然后组装到光解水系统中;通入高纯氮气30min,排除反应体系中的溶解氧和管路中的空气;检查系统,打开恒温循环水,启动氙灯光源(功率300W),用CUT400滤去紫外光,检测光照6h后多级p-n结NiO@CdS复合纳米材料的光催化分解水制氢的活性。氢气含量采用联机气相色谱仪在线检测,TCD检测器,TDX-01气相填充柱,光解水产氢结果如表1所示。
表1. 多级p-n结NiO@CdS复合纳米材料的可见光光解水制氢的结果
光照时间(h) | 1 | 2 | 3 | 4 | 5 | 6 |
H<sub>2</sub>量(mL/g) | 1.6839 | 3.1825 | 4.4658 | 6.083 | 7.6306 | 9.2755 |
以上所述仅是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以作出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。本发明中未具体描述和解释说明的结构、装置以及操作方法,如无特别说明和限定,均按照本领域的常规手段进行实施。
Claims (13)
1.一种用于光解水制氢的中空多级p-n结NiO@CdS复合纳米材料及其制备方法,其特征在于,为内部中空的球形结构,球壳由各p型氧化镍纳米片组装而成,氧化镍纳米片所处的平面与球壳的厚度方向保持一致,相邻的纳米片之间围合构成孔隙,氧化镍纳米片的表面为介孔结构,n型硫化镉纳米颗粒负载在p型氧化镍纳米片的表面,形成具有p-n结的NiO/CdS复合纳米结构。
2.根据权利要求1所述的用于光解水制氢的中空多级p-n结NiO@CdS复合纳米材料,其特征在于,硫化镉为六方纤锌矿相结构,纳米颗粒的粒径为10-30nm,氧化镍为立方相结构,中空微球的外直径为0.8-1.2μm,由多孔的厚度为7~9nm的纳米片交叠组装而成。
3.一种用于光解水制氢的中空多级p-n结NiO@CdS复合纳米材料的制备方法,其特征在于,包括制备NiO-Cd(Tu)x 2+中空微球和将NiO-Cd(Tu)x 2+中空微球进行热处理得到多级p-n结NiO@CdS复合纳米材料。
4.根据权利要求3所述的用于光解水制氢的中空多级p-n结NiO@CdS复合纳米材料的制备方法,其特征在于,NiO-Cd(Tu)x 2+中空微球的制备方法具体如下:
将溶液A与溶液B混合进行恒温反应,然后对恒温反应后的产物进行烧焙处理得到NiO中空微球,再将NiO中空微球分散于溶液C中,加入溶液D进行反应处理制得NiO-Cd(Tu)x 2+中空微球;
溶液A为镍源溶液;
溶液B为沉淀剂溶液;
溶液C为镉源溶液;
溶液D为硫源溶液。
5.根据权利要求3所述的用于光解水制氢的中空多级p-n结NiO@CdS复合纳米材料的制备方法,其特征在于,热处理为微波处理。
6.根据权利要求4所述的用于光解水制氢的中空多级p-n结NiO@CdS复合纳米材料的制备方法,其特征在于,溶液A为氯化镍溶液与氨水混合配制而成,按照每1mol氯化镍加入4mL氨水比例进行配置,氨水的质量浓度为25%-28%。
7.根据权利要求4所述的用于光解水制氢的中空多级p-n结NiO@CdS复合纳米材料的制备方法,其特征在于,溶液B为尿素水溶液,溶液A与溶液B按照氯化镍与尿素的摩尔比为1:1~10进行混合反应。
8.根据权利要求4所述的用于光解水制氢的中空多级p-n结NiO@CdS复合纳米材料的制备方法,其特征在于,溶液D为硫脲水溶液与乙二胺的混合液,按照每1mol硫脲加入0.1~0.4mL乙二胺的比例混合配制成。
9.根据权利要求4所述的用于光解水制氢的中空多级p-n结NiO@CdS复合纳米材料的制备方法,其特征在于,溶液C为醋酸镉水溶液,溶液C与溶液D按照醋酸镉与硫脲的摩尔比为0.1~1:1进行反应。
10.根据权利要求4所述的用于光解水制氢的中空多级p-n结NiO@CdS复合纳米材料的制备方法,其特征在于,溶液A与溶液B反应在恒温水浴锅中进行,水浴的温度为90℃,反应时间为2.5h,对反应产物进行抽滤、洗涤、干燥、研磨后得到Ni(OH)2中空微球。
11.根据权利要求10所述的用于光解水制氢的中空多级p-n结NiO@CdS复合纳米材料的制备方法,其特征在于,焙烧处理是将Ni(OH)2中空微球在马弗炉中进行焙烧得到NiO中空微球,控制焙烧温度为400℃,时间为2小时。
12.根据权利要求4所述的用于光解水制氢的中空多级p-n结NiO@CdS复合纳米材料的制备方法,其特征在于,NiO中空微球浸渍于溶液C中后,超声分散10min,加入溶液D混匀,采用PE膜封口,磁力搅拌反应12h,得到吸附镉离子配合物的NiO-Cd(Tu)x 2+中空微球。
13.根据权利要求5所述的用于光解水制氢的中空多级p-n结NiO@CdS复合纳米材料的制备方法,其特征在于,微波加热时间为30min,功率800W。
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